DV-S15 (serv.man9). Troubleshooting - Sharp DVD Service Manual (repair manual). Page 2

1-8-2

E56H0TS

When the output voltage fluctuates.

Yes

No

No

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

No

FLOW CHART NO.5
When buzz sound can be heard in the vicinity of the power circuit.

The fluorescent display tube does not light.

Is the voltage of 5V supplied to Pins(6, 24)
of IC2001?

Is the voltage of -24V supplied to Pin(15) of 
IC2001?

Is there 500kHz oscillation to Pin(26) of IC2001?

Check the signal lines of FP-DIN, FP-DOUT, 
FP-CLK, FP-STB of IC2001 and CN1001?

Are the filament voltage applied between (1, 2)
and (34, 35) of the fluorescent display tube?
Also negative voltage applied between these pins 
and GND?

Replace the fluorescent display tube.

Check the EV 5V line.

Check the -FL (-24V) line.

Check R2001, IC2001 and their periphery.

Check or replace IC2001 and DVD Main CBA unit.

Check or replace the power circuit, D1016, D1017 
and R1042, and their periphery.

The key operation is not functioning.

Are the contact point and the installation state of the 
key switches(SW2011-2014, 2016, 2017) normal?

Is the control voltage normally supplied to 
Pins(3, 4, 7, 8, 9, 10) of IC2001?

Check the key switches (2011-2014, 2016, 2017), 
and their periphery circuit.

Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side.
(D1003, D1008, D1009, D1013, D1016, D1030, IC1002, Q1002, Q1004, Q1007, Q1011, Q1014)

Does the photo coupler circuit on the secondary 
side operate normally?

Does the photo coupler circuit on the primary side
operate normally?

Check the circuit and replace the parts.
(IC1001, IC1006, D1048, D1015)

Check the circuit and replace the parts.
(IC1001, D1020, D1024)